code: def feats_scp(tmp_path):
      p = tmp_path / "feats.scp"
      p2 = tmp_path / "feats.ark"
      with kaldiio.WriteHelper(f"ark,scp:{p2},{p}") as w:
          w["a"] = np.random.randn(100, 80)
          w["b"] = np.random.randn(150, 80)
      return str(p)
  
imports: import h5py
  import kaldiio
  import numpy
  import pytest
  from espnet2.fileio.npy_scp import NpyScpWriter
  from espnet2.fileio.sound_scp import SoundScpWriter
  from espnet2.train.dataset import ESPnetDataset
label_desc: Use image node_id 4 for calling a global function with example usage: feats_scp(tmp_path) and returns: str